All Free Chemistry MCQs with Answers

• A. Buttons & buckles
• B. Tanning of leather
• C. Gelatin
• D. Bakery goods

Explanation: Major applications of casein are paper coatings, glues, paints, plastics, and man-made fibres, buttons and buckles.

• A. Coagulation
• B. Dehydration
• C. Denaturation
• D. None of these options are correct

Explanation: Protein structure can be disrupted by heating, changing, and by chemicals. This process is called denaturation.

• A. Work done
• B. Internal energy change
• C. Enthalpy
• D. Entropy

Explanation: At constant volume, the heat of the reaction is equal to the 'change in the internal energy of the system'.

• A. The only covalent compounds with high melting points are those in which hydrogen bonds occur.
• B. Any covalent compound that contains both oxygen and hydrogen in its molecule forms hydrogen bonds.
• C. lonic bonds and covalent bonds cannot both occur in the same compound.
• D. lonic compounds differ from metals in that ionic compounds do not conduct electricity in the solid state.

Explanation: The explanation for this question will be added soon.

• A. Diamond
• B. NaCl
• C. Graphite
• D. None of the above

Explanation: Molecular crystals are substances that have relatively weak intermolecular binding, such as dry ice (solidified carbon dioxide), solid…

• A. Ice
• B. Iodine
• C. Sugar
• D. Salt

Explanation: Option A: Ice, glucose and urea are examples of hydrogen bonded molecular solids due to the hydrogen bonded in the molecular solids.

• A. H-bonding
• B. London dispersion forces
• C. Dipole-dipole forces
• D. Chemical bonding

Explanation: Option B "LONDON DISPERSION FORCES " is the correct option. London dispersion forces are forces of attraction between nonpolar molecules…

• A. Sodium chloride
• B. Dry ice
• C. Copper
• D. CaCl2

Explanation: 'Discrete molecules' are units of a compound, the smallest possible i.e.

• A. 2
• B. 3
• C. 4
• D. 6

Explanation: Option A is correct as only 2 isomers are possible for Chloropropane. These structural isomers are 1- Chloropropane and 2- Chloropropane.

• A. 7
• B. 6
• C. 5
• D. 4

Explanation: Hexane (C6H14) has five possible isomers. The isomers are as follows;- Hexane, CH3CH2CH2CH2CH2CH3, a six carbon containing, saturated…

• A. 1 and 2
• B. 2 and 3
• C. 1 only
• D. All 1, 2 and 3

Explanation: The explanation for this question will be added soon.

• A. Positional isomerism
• B. Geometrical isomerism
• C. Cis-trans isomerism
• D. Functional group isomerism

Explanation: Alkynes can exhibit positional isomerism where the position of the triple bond changes within the carbon chain.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: For geometric isomerism to be possible two adjacent carbon atoms must have two different groups attached to them which is only in the case…

• A. 4
• B. 3
• C. 2
• D. 1

Explanation: CH4 is a hydrocarbon molecule consisting of four carbon atom. It can exist in only two structural isomers: The two isomers of C4H10 differ…

• A. Reforming
• B. Isomerism
• C. Polymorphism
• D. Hybridization

Explanation: Compounds that have the same molecular formula but different chemical structures are called isomers and phenomenon is called…

• A. Methane
• B. Ethane
• C. Propane
• D. Butane

Explanation: d) ButaneButane (C4H10) is a hydrocarbon consisting of four carbon atoms and ten hydrogen atoms.

• A. Amino acids
• B. Ketones
• C. Carboxylic acids
• D. All of these options are correct

Explanation: Tautomerism is when a carbon-carbon double bond is shifted to another atom.

• A. 2
• B. 4
• C. 6
• D. 5

Explanation: Butane has two isomers. The two chain isomers of butane (C4H10) are n-butane and isobutane. Hence, A is the correct option

• A. Electron
• B. Carbon atom
• C. Functional group
• D. H-atom

Explanation: Option A is wrong because tautomerism doesn't involve the transfer of electrons. It involves the transfer of hydrogen atoms.

• A. Two
• B. Four
• C. Three
• D. Five

Explanation: Pentane has 'three isomers': n-pentane, iso-pentane, and neo-pentane.